on the topic of the rice, The Blowers Daughter is really powerful and intense as well.

Just my opinion, but Puritania by Cradle of Filth really gets me going.

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Swans - Beautiful Child (i think that's the name,it's on Children of God)

wendy carlos - timesteps

I think Sick Sick Sick by Queens of the Stone Age is pretty intense.

Some other possible candidates would be Black Dog or Achilles Last Stand by Led Zeppelin. Black Dog can sound kinda wimpy when you start out, but by about 1 minute to the end, you just can't stop head-banging. And Achilles Last Stand is proof, I think, that a song doesn't have to be loud or incoherent to be intense. It's a ten-minute long marathon, and you start wondering how anybody could possibly have enough energy to rock so hard for so long.

Depends what you mean by intense. Here's what I think:

Non-Objective Portrait of Karma by Circle Takes the Square
Fault and Fracture by Converge
There Are Objects & Objects by A Day in Black and White
Song About an Angel and Sometimes by Sunny Day Real Estate

All of As the Roots Undo is pretty intense

Danse Macabre by Celtic Frost is pretty intense, not through sonic noise-just it's composition-really freaks me out!

Slayer-Reign in Blood is a brilliant example of controlled aggression.

Death-Open Casket.

Swans-Anything from their debut EP

Joy Division-Day Of The Lords

Obituary-Intoxicated

Intense can mean many things...

Kreator - Murder Fantasies
High on Fire - 10,000 Years
Pink - Electric
Electric Wizard - Vinum Sabbathi
King Crimson - Fractured
White Zombie - El Phantasmo and the Chicken-Run-Blasto-Rama